A Bucket of Blood

Roger Corman’s 1959 horror-comedy A Bucket of Blood tells the story of Walter Paisley, a murderous artist who works in a beatnik coffeehouse. As Michael Ned Holte writes, “The bumbling busboy Walter Paisley gains plaudits from the finicky intelligentsia for his “far-out” sculptures, which (unbeknownst to his new fans) are constructed over the corpses of victims that are at first accidental, but eventually intentional as the success goes to his head.”
See Holte’s article on Roger Corman.